Source : Webster's Revised Unabridged Dictionary (1913)

Scary \Sca"ry\, n. [Prov. E. scare scraggy.]
   Barren land having only a thin coat of grass. [Prov. Eng.]

Scary \Scar"y\, a. [From {Scare}.]
   1. Subject to sudden alarm. [Colloq. U. S.] --Whittier.

   2. Causing fright; alarming. [Colloq. U. S.]

Source : WordNet®

scary
     adj : so scary as to cause chills and shudders; "the most terrible
           and shuddery...tales of murder and revenge" [syn: {chilling},
            {scarey}, {shivery}, {shuddery}]
     [also: {scariest}, {scarier}]